add a word automatically if i insert text in a cell

Hi, I a have a cell where I want only insert minutes, for example "35" and I want that in my spreadsheet in the column i can see "35 minutes". How can i add "minutes" automatically? 

If in the cell i don't write anything i don't want see "minutes" .

Are you referring to this form: http://www.jotformeu.com/form/62770593245360? If you want to add Minutes text to your field, please try to setup the Input Mask to the field. 

Once you have added the Input Mask, the data that will be submitted will now have "Minutes" text and will be reflected on your submission page and/or excel report.

Do let us know if you need further assistance.
Regards.

Thank you very much